ब्रह्म मुहूर्त में सुबह ४ से ६ बजे के बीच या सूर्यास्त के समय। The earliest mantras ended up translated by Guru Gorakhnath who had attained Samadhi or the last word union with god. As a result of their Original intended reason, these mantras have been meant to operate https://www.youtube.com/watch?v=1G1uzSVseNU